anchor worm

[John]

No need, I can answer this for you. Anchor worm will persist in the pond - they won't disappear completely just because of a mild English winter. The pond would have to be treated with an anti-parasitic or completely dried out for several months. Rana temporaria shouldn't really have issues with anchor worm so I wouldn't blame the anchor worms for that. Did you experience a cold snap (freezing?) recently? That can kill the occasional common frog.

[JBRJBR]

Thank you for your help, John.
No, we haven't experienced anything other than brief excursions once or twice a degree or so below freezing, and there has never been any ice on the pond. Perhaps the two frogs died of natural causes - old age? Like me!
We can see a large number of tiny tadpoles all over the bottom of the pond, so at least some are surviving.
Perhaps I'll look into anti-parasitics, just in case.
Thanks again,
John